Hi I'm in the process of revisiting the TSM storage IO requirements and thought I'd just get a heads up for any previous experience, corrections etc.
From what I can gather in the documentation * File based storage pools are read/written in 256KB chunks * DB is read and written in 64KB chunks. But.... what is the profile of active logs? archive logs? Is there a way to increase the IO depth/concurrency when TSM reads/writes to the storage pool etc Does MOVESIZETHRESH and TXNBYTELIMIT offer much improvement? Is there any way to determine if the DB/DB logs are slowing the streaming from the Disk pools? Do you know what the equiv "fio" would be to generate the same load pattern as TSM. Using fio I was able to push a LUN to 300MB/s sequential read but with TSM I'm getting about 60-70MB/s for a migration from file to an LTO5 drive. Disk is not contended CPU is fine....any tips? Grant
